Optimize install script

Signed-off-by: Jianhui Zhao <jianhuizhao329@gmail.com>

install.sh

@@ -2,6 +2,7 @@
 
 update-rc.d rttys remove
 
-cp ../../../../bin/rttys /usr/sbin/
+which rttys > /dev/null && rm `which rttys`
+cp ../../../../bin/rttys /usr/local/sbin/
 cp rttys.init /etc/init.d/rttys
 update-rc.d rttys defaults

rttys.init

@@ -17,7 +17,7 @@ RTTYSPID=/var/run/rttys.pid
 PORT=5912
 
 do_start () {
-	start-stop-daemon --start --make-pidfile --pidfile $RTTYSPID --background --exec /usr/sbin/rttys -- -port $PORT
+	start-stop-daemon --start --make-pidfile --pidfile $RTTYSPID --background --exec /usr/local/sbin/rttys -- -port $PORT
 }
 
 do_stop () {